For the purposes of this list, we looked only at the billionaires' direct descendants and excluded grandkids. Notably, this methodology means that some high-profile billionaires' grandchildren amongst them Franois Pinault's grandson of the same name , Francoise Bettencourt Meyers' grandson who was called " The Prince of L'Oreal ," and the Walton grandchildren are not included in the round-up.